JP2007216657A - Moisture-permeable waterproof fabric and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a moisture-permeable waterproof fabric which is inexpensive and can be easily manufactured, while having an excellent moisture-permeable waterproof property. <P>SOLUTION: The moisture-permeable waterproof fabric comprises a urethane resin coated film containing a finely porous film formed on at least one surface of a fiber fabric wherein the finely porous film contains calcium carbonate particles. The content of the calcium carbonate particles contained based on 100 pts.mass of the urethane resin forming the finely porous film is 10 to 100 pts.mass by a mass ratio. The average particle diameter of the calcium carbonate is 0.05 to 5 μm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a moisture-permeable waterproof fabric and a method for producing the same.

Moisture such as knitted feathers, ski wear, windbreakers, tents, and shoe materials are allowed to pass through, but moisture-permeable waterproof fabrics are used for various materials as materials that prevent the entry of water such as rain. .
As such a moisture-permeable waterproof fabric, for example, a coated fabric having a microporous film obtained by coating a polyurethane polymer resin solution on one side of a fiber fabric and wet coagulating (Patent Document) 1) and a moisture-permeable waterproof fabric (Patent Document 2) obtained by bonding a non-porous film of urethane resin to one side of a fiber fabric is known.

In particular, the microporous membrane obtained by wet coagulation is generally superior in moisture permeability measured by the JIS L1099 calcium chloride method (A-1 method) as compared with a nonporous membrane laminated. Although it is easy to obtain, water resistance and water permeability by the potassium acetate method (JIS L1099B-1 method) are slightly low, and higher moisture permeability and water resistance are desired.

Therefore, by incorporating hydrophobic silicon dioxide having an average particle size of 0.016 μm and an oil absorption of N, N-dimethylformamide of 350 ml / 100 g or more into the resin layer, the moisture permeability by the calcium chloride method is 9820 g / m ^2. A moisture-permeable waterproof fabric having a water pressure resistance of 1.12 kgf / cm ² (112 kPa) is known. (Patent Document 3).
JP-A-55-80583 JP-A-7-9631 JP-A-6-272168

However, hydrophobic silicon dioxide having an oil absorption amount of N, N-dimethylformamide of 350 ml / 100 g or more and an average particle size of 0.016 μm is a special particle and is expensive, and the resulting moisture-permeable waterproof fabric is obtained. There was a problem that it would be very expensive. In addition, the use of particles having an average particle diameter of 1 μm or more is not effective (Cited Document 3 Comparative Example 1), the particle diameter is strictly controlled, and such small particles are maintained in the resin film. In addition to taking measures such as agglomeration of particles, it takes time and effort in production, and it is very difficult to stabilize performance such as moisture permeability and waterproofness.
Accordingly, an object of the present invention is to provide a moisture-permeable waterproof fabric that is inexpensive and easy to produce while having excellent moisture permeability and waterproofness.

As a result of intensive studies in order to solve the above problems, the present inventors have come up with the present invention.
That is, this invention consists of the following structures (1)-(7).

(1) A moisture-permeable waterproof fabric in which a urethane resin coating including a microporous membrane is formed on at least one surface of a fiber fabric, wherein the microporous membrane includes calcium carbonate particles. Fabric.
(2) The moisture-permeable waterproof fabric according to (1), wherein the calcium carbonate particles are included in a mass ratio of 10 to 100 parts by mass with respect to 100 parts by mass of the urethane resin forming the microporous membrane. .
(3) The moisture-permeable waterproof fabric according to (1) or (2) above, wherein the calcium carbonate particles have an average particle diameter of 0.05 μm to 5 μm.
(4) The moisture-permeable waterproof fabric according to any one of (1) to (3) above, wherein the microporous membrane also contains aluminum oxide fine particles or silicon oxide fine particles.

(5) The moisture-permeable waterproof fabric according to (4) above, wherein the aluminum fine particles or the silicon dioxide fine particles contain 0.1 to 30 parts by mass with respect to 100 parts by mass of the calcium carbonate.
(6) Water pressure is below 200kPa than 100 kPa, the moisture permeability by the calcium chloride method is not more than 8000g ^/ m 2 · 24hrs or more 15000g ^/ m 2 · 24hrs, water vapor permeability with potassium acetate method is 10000g ^/ m 2 · 24hrs The moisture-permeable waterproof fabric according to any one of (1) to (5) above, which is 30000 g / m ² · 24 hrs or less.
(7) A method for producing a moisture-permeable waterproof fabric, characterized in that a urethane resin solution containing calcium carbonate particles is applied to a fiber fabric and then immersed in water to solidify the urethane resin.

  The moisture-permeable waterproof fabric of the present invention is easy to manufacture while having excellent moisture permeability and waterproof property. Therefore, a moisture-permeable waterproof fabric having excellent moisture permeability and waterproofness can be provided at low cost, and the moisture-permeable waterproof fabric of the present invention can be used as a windbreaker, coat, jacket, skiwear, If used for snowboard wear, tents, etc., it is possible to provide a user with an inexpensive and comfortable environment.

The moisture-permeable waterproof fabric of the present invention is a moisture-permeable waterproof fabric in which a urethane resin coating including a microporous membrane is formed on at least one surface of a fiber fabric, and the calcium porous particles are included in the microporous membrane. The fiber fabric material useful in the present invention includes polyester, nylon, acrylic, polyurethane, acetate, rayon, polylactic acid and other chemical fibers, cotton, hemp, silk, wool and other natural fibers, and mixtures thereof. It may be a textile, a blend, or a woven product, and is not particularly limited. Further, they may be in any form such as woven fabric, knitted fabric, non-woven fabric.
The fiber fabric may be subjected to dyeing and printing, antistatic processing, water repellent processing, antibacterial and deodorizing processing, antibacterial processing, ultraviolet shielding processing, and the like.

The microporous membrane of the present invention has a structure having fine pores of about 1 μm or less on the surface, pores of about 10 to 50 μm inside, further pores formed on the wall surface, and communication with each other have.
The thickness of the microporous membrane is preferably about 10 to 100 μm, and if it is less than 10 μm, the water pressure resistance is low, and if it exceeds 100 μm, the moisture-permeable waterproof fabric obtained becomes hard.
The urethane resin is not particularly limited as long as it is a urethane resin for forming a microporous film, and is not limited to ether, ester, ether-ester, polycarbonate, etc. What is necessary is just to select, but when manufacturing by a wet method, what forms a microporous film | membrane is used preferably, and ester-type polyurethane resin is used especially.

The microporous membrane of the present invention includes calcium carbonate particles in the microporous membrane.
Examples of the calcium carbonate particles used at this time include heavy calcium carbonate obtained by pulverizing limestone and chemically produced precipitated calcium carbonate. Further, the average particle diameter of about 0.01 μm to 50 μm can be used, and the particles may be in the form of primary particles or secondary aggregates thereof. Also, the shape may be a needle shape, a column shape, a weight-proof shape, a cubic shape, a spherical shape, a plate shape, a curved ball shape, a chain shape, an aggregate or an indeterminate shape thereof, and is not particularly limited.
Further, these surfaces may be subjected to a surface treatment with a fatty acid, a resin or the like.
Further, the calcium carbonate particles are obtained by premixing the agglomerated particles with a urethane resin as a dimethylformamide solvent or a vehicle, a dispersant, and the like with a dither, etc., a sand mill, a three-roll mill, It is more preferable to use a powder that has been pulverized to a mean particle size of 0.05 to 5 μm with a bead mill.

  Further, the content of the calcium carbonate particles is preferably 10 to 100 parts by mass of the calcium carbonate particles by mass ratio with respect to 100 parts by mass of the urethane resin forming the microporous membrane. More preferably, 40 mass parts-70 mass parts are preferable. In general, it was thought that when a large amount of inorganic particles was added to the resin, the resulting film became brittle and the water pressure resistance decreased and the texture was cured. However, in the calcium carbonate of the present invention, other inorganic compounds are used. In comparison, it is possible to obtain a film having a feeling of swelling and an excellent moisture permeability by the calcium chloride method and the calcium acetate method without decreasing the water pressure resistance.

In the present invention, the microporous film may further include at least one of fine particles such as aluminum oxide and silicon dioxide. In particular, aluminum oxide or silicon dioxide is preferable.
As the aluminum oxide, those having an average primary particle size of 0.05 μm or less produced by a dry combustion method or an arc method are preferably aggregated to a size of about 0.1 to 50 μm.
Moreover, as silicon dioxide, the average primary particle diameter produced by a dry combustion method or an arc method is 0.05 μm or less, and these are aggregated to a size of about 0.1 to 50 μm, Moreover, what was manufactured by the precipitation method of the wet method and the gel method, and a primary particle diameter is 0.05 micrometer or less, and these things aggregated to the magnitude | size of about 0.1-50 micrometers can be used.
These surfaces may be subjected to a hydrophobic treatment with a methyl group, a trimethylsilyl group, a dimethylsilicone group or the like.
Further, the aluminum oxide fine particles and silicon dioxide fine particles are pre-mixed with a urethane resin or a dispersant as a dimethylformamide solvent or vehicle and premixed with a disperser etc. It is preferable to use a product pulverized to an average particle size of 0.05 to 5 μm by a roll mill, a bead mill or the like.

The addition amount of these fine particles is preferably 0.1 to 30 parts by mass with respect to 100 parts by mass of the calcium carbonate.
By adding these particles to the calcium carbonate particles, the moisture permeability by the calcium acetate method can be improved without substantially reducing the water pressure resistance or moisture permeability by the calcium chloride method.

The polyurethane resin coating containing the microporous membrane of the present invention may be composed only of the microporous membrane. Also, the purpose of improving the water pressure resistance, imparting a pattern, or slipping on one side of the microporous membrane. Other urethane resin films may be provided on the entire surface or partially in the form of dots or lines for the purpose of improving the properties.
Further, the thickness of the polyurethane resin film including the microporous film is preferably 10 to 100 μm, and if it is less than 10 μm, the water pressure resistance is low, and if it exceeds 100 μm, the moisture-permeable waterproof fabric obtained becomes hard.
In the moisture-permeable waterproof fabric of the present invention, the polyurethane resin coating containing the microporous membrane is formed on one side or both sides of the fiber fabric.

In the moisture-permeable waterproof fabric in the present invention, it is only necessary to obtain one having moisture permeability and water pressure required depending on the application. However, as the urethane resin film, the urethane resin film consists only of a microporous film, or on a microporous film. In addition, the water pressure is 100 kPa or more and 200 kPa or less, the moisture permeability by the calcium chloride method is 8000 g / m ² · 24 hrs or more and 15000 g / m ² · 24 hrs or less, potassium acetate moisture permeability can be obtained as 10000g ^/ m 2 · 24hrs or more 30 000 g ^/ m of 2 · 24hrs or less by law.

If the water pressure resistance exceeds 200 kPa, the moisture permeability may decrease, the moisture permeability in the calcium chloride method may exceed 15000 g / m ² · 24 hrs, and the moisture permeability in the potassium acetate method may exceed 30000 g / m ² · 24 hrs. There is a risk that the water pressure will decrease.
However, in particular, in a field where the water pressure resistance is required to be 200 kPa or more, a nonporous film made of a polyurethane resin may be provided on the entire surface of the microporous film.
The moisture permeability by the calcium chloride method here refers to a value measured by the JIS L1099-1993B-1 method. The calcium chloride method refers to a value measured by the JIS L1099-1993A-1 method. The calcium chloride method and the calcium acetate method are both converted to moisture permeation per 24 hours.

  The water pressure resistance is a value measured by a method according to JIS L1092-1998 water resistance test (hydrostatic pressure method) B method (high water pressure method). When the test piece is stretched by applying water pressure, a nylon taffeta (with a total of about 210 warps and wefts per 2.54 cm) is stacked on the test piece and attached to the testing machine. And measured.

Next, the present invention will be described in more detail according to one preferred production method of the present invention.
The preferable manufacturing method of the moisture-permeable waterproof fabric of this invention is good to apply | coat the urethane resin solution containing a calcium carbonate particle to a fiber fabric, and to immerse in water and to solidify a urethane resin.
The fiber fabric may be subjected to scouring, dyeing, printing, antistatic processing, water repellent processing, antibacterial deodorization processing, antibacterial processing, ultraviolet shielding processing, calendar processing, and the like as necessary.

The urethane resin solution containing calcium carbonate particles to be applied to the fiber fabric includes the above urethane resin and calcium carbonate particles, and a water-soluble solvent such as dimethylformamide (hereinafter DMF), dimethylacetamide, N-methylpyrrolidone as a solvent. Those mainly composed of a polar organic solvent are preferably selected.
In the urethane resin solution containing the calcium carbonate particles, fine particles such as aluminum oxide, organic fine particles such as pigments, crosslinking agents, catalysts, antioxidants, and ultraviolet absorbers may be added.

The resin solution is applied to the fiber fabric using a knife coater, bar coater, comma coater or the like.
Next, the fiber fabric coated with the urethane resin solution is immersed in water containing water or an organic solvent such as DMF used in a 5 to 20% urethane resin solution to solidify the urethane resin. The solidification temperature is preferably in the range of 10 to 50 ° C. from the viewpoint of appropriately adjusting the diameter of the microporous pores formed in the resin film.

Next, desolvation is performed. As the solvent removal, water is preferable, and the temperature of solvent removal is preferably selected in the range of 10 to 80 ° C. After removing the solvent, drying is performed at about 90 to 150 ° C.
Thereafter, if necessary, water-repellent processing, anti-static processing, water-repellent processing, antibacterial and deodorizing processing, antibacterial processing, ultraviolet shielding processing and the like may be performed.
Moreover, in addition to the microporous film, when further applying a urethane resin film to the entire surface of the microporous film,

(1) A urethane resin solution is applied and dried on a release paper to form a urethane resin film, and then an adhesive is applied on the urethane resin film obtained on the release paper. A porous film and a nonporous urethane resin film are bonded together. Thereafter, after aging at 30 to 80 ° C. for about 4 to 100 hours as necessary, a laminating method in which the release paper is peeled off, or (2) a urethane resin solution is applied onto the microporous film by a knife coater or Other urethane resin films can be applied onto the microporous film by a direct coating method in which a urethane resin film is applied and dried by a pipe coater or the like.

In addition, when a urethane resin film is partially applied on the microporous film, a gravure coater or a screen printing machine is used on the microporous film, and dot-like, linear, diamond-like or other A urethane resin solution may be applied on the handle and dried.
Also, after applying another urethane resin film on the microporous film, water repellent finish, anti-static finish, water repellent finish, antibacterial deodorizing finish, antibacterial finish, UV shielding finish, calendar finish etc. You may do.

EXAMPLES Hereinafter, although an Example demonstrates this invention further, this invention is not limited at all by these Examples. Moreover, "part" in an example is a mass part.
Evaluation in the following examples was based on the following method.

The thickness of the layer A was measured by observation with an electron microscope.
B Measured by moisture permeability potassium acetate method JIS L1099-1993B-1 method.
Calcium chloride method Measured by JIS L1099-1993A-1 method.
The calcium chloride method and the calcium acetate method were both converted to moisture permeation per 24 hours.

C Water pressure resistance Measured by a method according to JIS L1092-1998 water resistance test (hydrostatic pressure method) B method (high water pressure method).
When the test piece is stretched by applying water pressure, nylon taffeta (with a total of about 210 warp and weft densities per 2.54 cm) is stacked on the test piece and attached to the tester. I did it.
D Observation of particles and fine particles in the microporous film Observation was performed with an electron microscope.
E Judged by touching hands.

Example 1
Polyester taffeta (warp yarn 83 decites / 72 filaments, weft warp yarn 83 decites / 72 filaments, density 114 / 2.54 cm, weft 92 / 2.54 cm) dyed blue with disperse dye, fluorine-based water repellent A fiber fabric was used that was subjected to water repellent treatment using a 5% aqueous solution of Asahi Guard AG710 and calendered at 170 ° C. and a pressure (linear pressure) of 128 kg / cm.

  Next, the following resin solution was applied to a fiber fabric to a thickness of 0.15 mm using a pipe coater, immersed in water containing 15% DMF, solidified with urethane resin, and immersed in 40 ° C. water and 20 ° C. water. After removing the solvent, it was dried at 120 ° C. for 3 minutes and set at 150 ° C. for 1 minute. A microporous film having a thickness of 35 μm and containing calcium carbonate was formed on one side of the fiber fabric.

Resin solution Ester-based polyurethane resin (solid content 25%) 100 parts DMF 20 parts Calcium carbonate dispersion 20 parts (average primary particle size 0.7 μm average particle size after dispersion 1.0 μm solid content 60%)
Isocyanate-based crosslinking agent 2 parts

The moisture permeability, water pressure resistance and the like of the obtained moisture permeable waterproof fabric are described below.

Moisture permeability Calcium chloride method 10090g ^/ m 2 · 24hrs
Potassium acetate method 11300 g / m ² · 24 hrs
Water pressure resistance 160 kPa
Observation of particles in the microporous membrane Many particles around 1 μm were confirmed.
The texture is soft.

Comparative Example 1
A moisture-permeable waterproof fabric was obtained in the same manner as in Example 1 except that the calcium carbonate particles were removed from the resin solution of Example 1.
The moisture permeability, water pressure resistance and the like of the obtained moisture permeable waterproof fabric are described below.

Moisture permeability Calcium chloride method 3500g ^/ m 2 · 24hrs
Potassium acetate method 2600g / m ² · 24hrs
Water pressure resistance 130 kPa
Observation of particles in the microporous membrane No particles were observed.
The texture is soft.

Example 2
A moisture-permeable waterproof fabric was obtained in the same manner as in Example 1 except that the following was used instead of the resin solution used in Example 1.
Resin solution Ester-based polyurethane resin (solid content 25%) 100 parts DMF 20 parts Calcium carbonate dispersion 20 parts (average primary particle size 0.7 μm average particle size after dispersion 1.0 μm solid content 60%)
7 parts of aluminum oxide (average primary particle size 13 nm, average particle size after dispersion 0.2 μm, solid content 14%)
The moisture permeability, water pressure resistance, etc. of the moisture permeable waterproof fabric obtained by 2 parts of the isocyanate-based crosslinking agent are described below.

Moisture permeability Calcium chloride method 10210 g / m ² · 24 hrs
Potassium acetate method 21300g / m ² · 24hrs
Water pressure resistance 160 kPa
Observation of particles in the microporous membrane Many particles having a size of about 1 μm and about 0.2 μm were confirmed.
The texture is soft.

Example 3
A moisture-permeable waterproof fabric was obtained in the same manner as in Example 1 except that the following was used instead of the resin solution used in Example 1.
Resin solution Ester polyurethane resin (solid content 25%) 100 parts DMF 20 parts Calcium carbonate dispersion 20 parts (average primary particle size 30 nm after dispersion average particle size 3.0 μm solid content 40%)
3 parts of aluminum oxide (aggregate having an average primary particle size of 13 nm, average particle size after dispersion of 0.5 μm, solid content of 14%)
The moisture permeability, water pressure resistance, etc. of the moisture permeable waterproof fabric obtained by 2 parts of the isocyanate-based crosslinking agent are described below.

Moisture permeability Calcium chloride method 10090g ^/ m 2 · 24hrs
Potassium acetate method 17400 g / m ² · 24 hrs
Water pressure resistance 160 kPa
Observation of particles in the microporous membrane A large number of particles of about 0.1 to 0.6 μm were confirmed.
The texture is soft.

Example 4
Polyester taffeta (warp yarn 83 decites / 72 filaments, weft warp yarn 83 decites / 72 filaments, density 114 / 2.54 cm, weft 92 / 2.54 cm) dyed blue with disperse dye, fluorine-based water repellent A fiber fabric was used that was subjected to water repellent treatment using a 5% aqueous solution of Asahi Guard AG710 and calendered at 170 ° C. and a pressure (linear pressure) of 128 kg / cm.

  Next, the following resin solution was applied to a fiber fabric to a thickness of 0.15 mm using a pipe coater, immersed in water containing 15% DMF, solidified with urethane resin, and immersed in 40 ° C. water and 20 ° C. water. After removing the solvent, it was dried at 120 ° C. for 3 minutes and set at 150 ° C. for 1 minute. A microporous film having a thickness of 20 μm and containing calcium carbonate was formed on one side of the fiber fabric.

Resin solution Ester-based polyurethane resin (solid content 25%) 100 parts DMF 20 parts Calcium carbonate dispersion 20 parts (average primary particle size 0.7 μm average particle size after dispersion 1.0 μm solid content 60%)
Silicon dioxide dispersion (surface treated with dimethylsilyl group for hydrophobic treatment) 5 parts (average primary particle size 0.02 μm, average particle size after dispersion 1.0 μm, solid content 15%)
Isocyanate-based crosslinking agent 2 parts

The moisture permeability, water pressure resistance and the like of the obtained moisture permeable waterproof fabric are described below.

Moisture permeability Calcium chloride method 9800g ^/ m 2 · 24hrs
Potassium acetate method 16500 g / m ² · 24 hrs
Water pressure resistance 140kPa
Observation of particles in the microporous membrane Many particles around 1 μm were confirmed.
The texture is soft.

Example 5
Polyester taffeta (warp warp 83 decites / 72 filaments, weft warp 83 decites / 72 filaments, density 114 / 2.54 cm, weft 92 / 2.54 cm) dyed blue with disperse dye, Asahi Guard AG710 5 A water-repellent treatment was performed using a 100% aqueous solution, and then calendered at 170 ° C. and a pressure (linear pressure) of 128 kg / cm was used as the fiber fabric.

  Next, the following resin solution was applied, immersed in water containing 15% DMF, the urethane resin was coagulated, desolvated in 40 ° C. water and 20 ° C. water, and then at 120 ° C. for 3 minutes. Perform drying. A microporous film having a thickness of 20 μm and containing calcium carbonate was formed on one side of the fiber fabric.

Resin solution Ester-based polyurethane resin (solid content 25%) 100 parts DMF 20 parts Calcium carbonate 20 parts (average primary particle size 0.7 μm average particle size after dispersion 1.0 μm solid content 60%)
2 parts of isocyanate-based cross-linking agent Next, the following resin solution was applied onto a release paper using a vip coater and dried at 120 ° C. to obtain a non-porous urethane resin film having a thickness of 15 μm.

Resin solution (for non-porous urethane resin film)
Ether polyurethane resin (solid content 30%) 100 parts Methyl ethyl ketone 30 parts White pigment 8 parts

Next, the following resin solution for the adhesive was applied in a spot shape on a nonporous urethane resin film using a gravure coater.
Resin solution (for adhesive)
Ether ester polyurethane resin (solid content 45%) 100 parts Toluene 30 parts Isocyanate crosslinking agent 9 parts Amine catalyst 0.3 part

Next, the microporous film and the nonporous film formed on the fiber fabric were bonded together with an adhesive and aged at 60 ° C. for 72 hours.
Next, after releasing the release paper, a gravure coater was used on the surface of the fiber cloth, and a water repellent treatment was performed using a 5% aqueous solution of a fluorine-based water repellent Asahigard AG710 to obtain a moisture permeable waterproof cloth.
The moisture permeability, water pressure resistance and the like of the obtained moisture permeable waterproof fabric are described below.

Moisture permeability Calcium chloride method 5200g ^/ m 2 · 24hrs
Potassium acetate method 11300 g / m ² · 24 hrs
Water pressure resistance 320 kPa
Observation of particles in the microporous membrane Many particles around 1 μm were confirmed.
The texture is soft.

Claims (7)

  A moisture-permeable waterproof fabric in which a urethane resin coating including a microporous membrane is formed on at least one surface of a fiber fabric, wherein the microporous membrane includes calcium carbonate particles.   2. The moisture-permeable waterproof fabric according to claim 1, wherein the calcium carbonate particles contain 10 to 100 parts by mass with respect to 100 parts by mass of the urethane resin forming the microporous membrane. 3. The moisture-permeable waterproof fabric according to claim 1, wherein the calcium carbonate particles have an average particle diameter of 0.05 μm to 5 μm.   The moisture-permeable waterproof fabric according to any one of claims 1 to 3, wherein the microporous film also contains aluminum oxide fine particles or silicon dioxide fine particles.   The moisture-permeable waterproof fabric according to claim 4, wherein the aluminum fine particles or the silicon dioxide fine particles are contained in an amount of 0.1 to 30 parts by mass with respect to 100 parts by mass of the calcium carbonate. Water pressure is below 200kPa than 100 kPa, moisture permeability 8000g ^/ m 2 · 24hrs or more 15000g ^/ m 2 · 24hrs or less by the calcium chloride method, the moisture permeability with potassium acetate method is 10000g ^/ m 2 · 24hrs or more 30 000 g / ^{m 2} -The moisture-permeable waterproof fabric according to any one of claims 1 to 5, which is 24 hrs or less.   A method for producing a moisture-permeable waterproof fabric, characterized in that a urethane resin solution containing calcium carbonate particles is applied to a fiber fabric and then immersed in water to solidify the urethane resin.